Selecting Compatible Lead Screws and Nuts
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Precision Acme Lead Screws and Nuts
Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.
932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. Cast iron nuts have good machinability and high strength.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size  | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
673 Bronze | ||||||||||||
| 1 1/4"-4 | 1 3/4" | 2.125" | 1 | 1:1 | 0.25" | 1 31/32"-18 | 13/16" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
673 Bronze | ||||||||||||
| 1 1/4"-4 | 1 3/4" | 2.125" | 1 | 1:1 | 0.25" | 1 31/32"-18 | 13/16" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
Thread onto an externally threaded acme nut to create a custom flange nut.
Carbon steel flanges have good machinability. However, they will rust when exposed to moisture. Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color. 303 stainless steel flanges have good corrosion resistance.
| Flange Thread Size | Flange Dia. | Flange Thick. | Bolt Circle Dia. | Flange Hardness | Each | |
1117 Carbon Steel | ||||||
|---|---|---|---|---|---|---|
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 156 | 000000000 | 000000 |
Black-Oxide 1117 Carbon Steel | ||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 135 | 00000000 | 00000 |
303 Stainless Steel | ||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 140 | 0000000 | 000000 |
Acme Lead Screws and Nuts
Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.
Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.
Round nuts move objects along the length of a lead screw.
| Thread Size | Ht. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
932 Bearing Bronze | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 2 1/64" | 2 5/32" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | ASTM B505 | 000000000 | 000000 |